I'm not sure where the graphic is someone put in one of the threads, but if you look at our squad:
I would say we are losing:
Casemiro
Zirzkzee
Ugarte
Bayandir
I would not be counting on these players to play the extra amount of games next season without injury:
Shaw
Mount
De Ligt
Martinez
So we at mininmum need to replace 4 players that are leaving and we'll only get money for 2 of them. Add to the fact we have two CBs, a LB and a midfielder/attacker that can't really be relied upon to stay fit, I do think the needs will require us to fork out that kind of money - unless we're shopping in the bargain bin. That's before you even think of upgrading the squad, ie having more options than this season.